1. ./demo_str.py
2. ./escape_sequences.py
3. ./get_num_letters_case_insensitive.py
4. ./search.py
5. ./string_compare.py
6. ./string_methods.py
7. ./test.py

# Demonstrate long strings and escape sequences
# by Sara Sprenkle

string = """This is a long string.
Like, really long.
Sooooo loooooong"""

print(string)

print("\n") # how many blank lines does this print?

print("To print a \\, you must use \"\\\\\"")

# Practice with escape sequences
# By CS111


# Display To print a tab, you must use '\t'.
print("To print a tab, you must use \'\\t\'.")
print("To print a tab, you must use '\\t'.")
print('To print a tab, you must use \'\\t\'.')


# how many blank lines does this print?
print("\n")


# Display I said, "How are you?"
print("I said, \"How are you?\"")
print('I said, \"How are you?\"')
print('I said, "How are you?"')

# Finds the number of times a letter appears in a phrase, case insensitive.
# Practice using the str API
# by CSCI111

import test

def get_num_letters(phrase, letter):
    """
    Parameters:
       - phrase: a string phrase
       - letter: a single letter
    returns the number of times the letter appears in
    the phrase, case insensitive
    """
    lower_letter = letter.lower()
    lower_phrase = phrase.lower()
    num_occurrences = lower_phrase.count(lower_letter)
    return num_occurrences
   

def test_get_num_letters():
    test.testEqual( get_num_letters("abracadabra", "a"), 5)
    test.testEqual( get_num_letters("Abracadabra", "a"), 5)
    test.testEqual( get_num_letters("abracadabra", "A"), 5)

test_get_num_letters()
    

# Demonstrate use of "in" operator for strings as well
# as an if test
# Sara Sprenkle

PYTHON_EXT = ".py"

filename = input("Enter a filename: ")

if PYTHON_EXT in filename:
    print "That filename contains", PYTHON_EXT


if filename[-(len(PYTHON_EXT)):] == PYTHON_EXT:
    print "That's a name for Python script"


# QUESTION: SHOULD THIS BE AN IF/ELIF?
# What is the impact of that change?

# Program compares two strings
# by Sara Sprenkle

str1 = input("Enter a string to compare: ")
str2 = input("Compare '" + str1 + "' with what string? ")

print("-" * 40)

if str1 < str2 :
    print("Lexicographically,", str1, "comes before", str2 + ".")
elif str1 > str2:
    print("Lexicographically,", str2, "comes before", str1 + ".")
else:
    print("You tried to trick me!", str1, "and", str2, "are the same word!")

# Manipulate strings, using methods
# by Sara Sprenkle

sentence = input("Enter a sentence to mangle: ")

length = len(sentence)

# Question: What does the statement below do?
print("*", sentence.center(int(length*1.5)), "*")

upperSentence = sentence.upper()
print(upperSentence)
print(sentence)

print("Uppercase: ", sentence.upper())
print()
print("Lowercase: ", sentence.lower())
print()

# Answer before running...
print("Did sentence change?: ", sentence)

sentence = sentence.lower()
print(sentence)

def testEqual(actual,expected,places=5):
    '''
    Does the actual value equal the expected value?
    For floats, places indicates how many places, right of the decimal, must be correct
    '''
    if isinstance(expected,float):
        if abs(actual-expected) < 10**(-places):
            print('\tPass')
            return True
    else:
        if actual == expected:
            print('\tPass')
            return True
    print('\tTest Failed: expected {} but got {}'.format(expected,actual))
    return False